This document updates and clarifies the switching system requirements and objectives for AMA data generation, formatting, retention,
output, integrity, timing, Reliability and Quality (R&Q), and miscellaneous AMA-related topics. It also provides the most current
platform for billing data generation of new network capabilities, new services, and switching-system evolution.

Issue 4 of GR-508 includes the following changes:

The introductory text of Section 4 has been moved to Section 2. Section 4 has been eliminated, and the requirements moved to
Section 3 as follows:

Trunk Group Member Number Recording is currently in Section 3.2.1.1.1.

CDAR is currently in Section 3.2.1.5.

Unanswered Call Recording is currently in Section 3.2.2.

The requirements formerly in Section 4 of Issue 3 have retained their permanently assigned absolute numbers which are in brackets.
The local requirement numbers in the left margin will change as requirements are added, deleted, or moved.

Section 3.4.3 has been re-written to reflect changed interconnection arrangements and regulatory rulings.